The "smart card" used to ride the London rail service is called an Oyster card.
according to Wikipedia:
Oyster was conceived and subsequently promoted because of the metaphorical implications of security and value in the component meanings of the hard bivalve shell and the concealed pearl. Its associations with London through Thames estuary oyster beds and the popular idiom 'the world is your oyster' were also significant factors in its selection as was the uniqueness of the word Oyster.
And, of course, don't forget to carry your oyster card in your
Genuine Sanrio Hello Kitty Oyster Card, BusPass Holder
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